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Investments Accounted for Using the Equity Method and Variable Interest Entities, or VIEs (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Feb. 03, 2021
Dec. 31, 2020
Investments Accounted for by the Equity Method      
Other current assets $ 14,572   $ 6,028
Total Assets 27,965   14,902
Current liabilities 12,009   1,915
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Agua Caliente Solar Project      
Investments Accounted for by the Equity Method      
Cash consideration   $ 202  
Variable Interest Entity, Primary Beneficiary      
Investments Accounted for by the Equity Method      
Accounts receivable 730   647
Other current assets 0   2
Total Assets 730   649
Current liabilities 78   78
Net assets $ 652   $ 571
Agua Caliente      
Investments Accounted for by the Equity Method      
Ownership interest   35.00%